%0 Journal Article
%A McKee, Suzanne
%A Wade, Alex
%A Pettet, Mark
%A Vildavski, Vladimir
%A Appelbaum, Greg
%A Norcia, Tony
%T Disparity processing in the human brain imaged with high density EEG
%B Journal of Vision
%D 2007
%R 10.1167/7.15.84
%J Journal of Vision
%V 7
%N 15
%P 84-84
%@ 1534-7362
%X  Psychophysical thresholds for relative disparity are far better when test and reference targets are presented in the same plane than when targets are presented in two planes separated by a pedestal disparity. Is this sensitivity difference reflected in the aggregate neural responses of different visual areas? We used high-density EEG recording, combined with fMRI-defined regions of interest, to localize the responses to disparity modulation in four visual areas: V1, V3A, V4 and hMT+. The stimulus consisted of randomly-spaced vertical lines. Alternating horizontal strips of the line pattern were either static or modulated repetitively by a 6 arcmin change in disparity. We compared the responses to disparity modulation in the same plane to modulation when the static and modulated strips were separated by a fixed 6 arcmin disparity pedestal. All four areas gave larger responses to modulation in the same plane than to modulation with the 6 arcmin pedestal. However, the biggest difference was observed in area hMT+, not V1. Extra-striate areas do not simply mirror response amplitudes in V1. Indeed, the form of the temporal responses in extra-striate areas was markedly different from the V1 response, suggesting that extra-striate areas may encode disparity-generated surface organization, as well as disparity magnitude. 
%[ 1/22/2021
%U https://doi.org/10.1167/7.15.84